Which clearer word can replace the word "right" in this context?

"Perpendicular lines: Lines that are at right angles (90°) to each other."

closed as off-topic by user21503, Brian Tompsett - 汤莱恩, Victor Bazarov, user3169, Maulik V Nov 9 '15 at 5:16

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    The term right angles is a technical term with a precise and unambiguous meaning in this context. You can't get better clarity by replacing the word right in your given sentence. – Lawrence Nov 8 '15 at 6:44

The only equivalent replacement would be what is already given in parentheses. In other words, perpendicular lines are lines that intersect each other at 90°. You can also say perpendicular lines are lines that are square to each other, but I don't know if the replacement makes it any clearer.

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